Engine & fuel system
1 documented fault — symptoms, causes and workshop fixes.
Oil leak from rear differential
Unsatisfactory design of rear differential breather valve causing pressure build up in rear differential. Fix: fit a modified part.
Overview
- Affects
- All models with four wheel drive, →07/11.
- Remedy
- Fit modified part
Repair steps
- Fit new driveshaft oil seals.
- Fit modified rear differential breather valve.
- Fit protective boot to rear differential breather valve. Ensure protective boot ventilation hole faces rear of vehicle.
Parts
| Part | Part number | Qty |
|---|---|---|
| Rear differential breather valve | B39M 26 060 | 1 |
| Protective boot | B39M 27 763 | 1 |
| Driveshaft oil seal | M0A7 27 238A | 2 |
Data: Motorwise Workshop. Bulletin 3.
Electrical & ignition
1 documented fault — symptoms, causes and workshop fixes.
Failure of left or right headlamp
Overview
- Affects
- All models with gas discharge headlamps.
- Remedy
- Fit new part
Cause
Headlamp igniter unit not fitted correctly causing poor connection.
Repair
- Ensure headlamp igniter unit is disconnected from power supply.
- Fit new headlamp bulb and headlamp igniter unit. Turn headlamp igniter unit fully clockwise until it locks into position.
Data: Motorwise Workshop. Bulletin 1.
Brakes
1 documented fault — symptoms, causes and workshop fixes.
Groaning noise from rear brakes when brakes applied
Vibration between brake pads and discs. Fix: fit a modified part.
Overview
- Affects
- All models.
- Remedy
- Fit modified part
Repair steps
- Remove rear brake pads.
- Clean mating surfaces of brake caliper and carrier.
- Apply grease to contact surfaces of rear brake pad back plates.
- Fit modified rear brake pads. Ensure brake pad anti-squeal shims are fitted.
Data: Motorwise Workshop. Bulletin 2.
Glossary
Technical terms used in this guide.
- Caliper
- The part that squeezes the brake pads onto the disc
- Driveshaft
- The shaft that takes drive from the differential out to a wheel
Frequently asked questions
What are the common faults with the Mazda CX-7 2.5?
This guide contains three workshop bulletins for the Mazda CX-7 2.5. Of these, one concerns the engine and fuel system and one the electrical and ignition. Symptoms, causes, repair steps and part numbers are shown where supplied.
Does every Mazda CX-7 2.5 have these faults?
No. These are patterns documented across the model by workshops, not predictions for an individual vehicle. Where a fault applies only to certain vehicles or VIN ranges, that is listed with the fault.
Can I check for Mazda CX-7 2.5 faults myself?
Many of them. The documented symptoms can be seen, heard or felt during a test drive.